Golf club head

Abstract

The golf club head includes a crown portion, a face portion and a sole portion. The crown portion is formed to have an average thickness, in a range of a predetermined length toward a back side from a boundary between the crown portion and the face portion, that changes moving toward the heel side from the toe side.

1 . A golf club head comprising:
 a crown portion;   a face portion; and   a sole portion,   wherein the crown portion is formed to have an average thickness, in a range of a predetermined length toward a back side from a boundary between the crown portion and the face portion, that changes moving from a toe side to a heel side.   
     
     
         2 . The golf club head according to  claim 1 ,
 wherein the crown portion includes:   a thick region provided at least in a location extending from the toe side to the heel side along the boundary with the face portion; and   at least one thin region that is disposed further on the backside than the thick region and is smaller in thickness than the thick region, and   the crown portion is formed such that a length of the thick region from the boundary in a face-back direction changes moving from the toe side to the heel side.   
     
     
         3 . The golf club head according to  claim 2 , comprising:
 a plurality of the thin regions that are arranged side-by-side from the toe side to the heel side,   wherein a distance between the boundary and each of the thin regions is different.   
     
     
         4 . The golf club head according to  claim 3 ,
 wherein the distance between the boundary and the thin region disposed on the toe side is shorter than the distance between the boundary and the thin region disposed on the heel side.   
     
     
         5 . The golf club head according to  claim 3 ,
 wherein the distance between the boundary and the thin region disposed on the toe side is longer than the distance between the boundary and the thin region disposed on the heel side.   
     
     
         6 . The golf club head according to  claim 2 , further comprising a hosel portion,
 wherein a percentage R (=S 1 /S 2 ) that a projected area S 1  of the thin region occupies in an area S 2 , which is a sum total of a projected area of the crown portion and the projected area of the hosel portion, is 25 to 70%.   
     
     
         7 . The golf club head according to  claim 2 ,
 wherein the crown portion is provided a gap thick portion disposed between each of the thin regions.   
     
     
         8 . The golf club head according to  claim 7 ,
 wherein the plurality of the thin regions includes a first thin region, a second thin region and a third thin region, the first thin region is disposed at the toe side of the crown portion, the second thin region is adjacent to the first thin region and disposed at the middle of the crown portion, the third thin region is adjacent to the second thin region and disposed at the heel side of the crown portion.   
     
     
         9 . The golf club head according to  claim 8 ,
 wherein the second thin region is formed in a fan shape that expands toward the back side from a face side.   
     
     
         10 . The golf club head according to  claim 1 ,
 wherein the crown portion includes:   a thick region provided at least in a location extending from the toe side to the heel side along the boundary with the face portion; and   at least one thin region that is disposed further on the back side than the thick region and is smaller in thickness than the thick region, and   the thin region changes in thickness moving toward the heel side from the toe side.   
     
     
         11 . The golf club head according to  claim 10 , comprising:
 a plurality of the thin regions that are arranged side-by-side from the toe side to the heel side, and   wherein the thicknesses of each of the thin regions are different.   
     
     
         12 . The golf club head according to  claim 11 ,
 wherein the thin region disposed on the toe side is smaller in thickness than the thin region disposed on the heel side.   
     
     
         13 . The golf club head according to  claim 11 ,
 wherein the thin region disposed on the toe side is larger in thickness than the thin region disposed on the heel side.   
     
     
         14 . The golf club head according to  claim 10 , further comprising a hosel portion,
 wherein a percentage R (=S 1 /S 2 ) that a projected area S 1  of the thin region occupies in an area S 2 , which is a sum total of a projected area of the crown portion and the projected area of the hosel portion, is 25 to 70%.   
     
     
         15 . The golf club head according to  claim 10 ,
 wherein the crown portion is provided a gap thick portion disposed between each of the thin regions.   
     
     
         16 . The golf club head according to  claim 11 ,
 wherein the plurality of the thin regions includes a first thin region, a second thin region and a third thin region, the first thin region is disposed at the toe side of the crown portion, the second thin region is adjacent to the first thin region and disposed at the middle of the crown portion, the third thin region is adjacent to the second thin region and disposed at the heel side of the crown portion.   
     
     
         17 . The golf club head according to  claim 12 ,
 wherein the second thin region is formed in a fan shape that expands toward the back side from a face side.   
     
     
         18 . A golf club head comprising:
 a crown portion;   a face portion; and   a sole portion,   wherein the crown portion includes:   a thick region provided at least in a location extending from a toe side to a heel side along a boundary with the face portion; and   at least one thin region that is disposed further on a back side than the thick region and is smaller in thickness than the thick region, and   a length of the thick region from the boundary in a face-back direction changes moving toward the heel side from the toe side.   
     
     
         19 . A golf club head comprising:
 a crown portion;   a face portion; and   a sole portion,   wherein the crown portion includes:   a thick region provided at least in a location extending from a toe side to a heel side along a boundary with the face portion; and   at least one thin region that is disposed further on a back side than the thick region and is smaller in thickness than the thick region, and   the thin region changes in thickness moving toward the heel side from the toe side.